uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/os-specific/windows/default.nix

@@ -0,0 +1,47 @@
+{ lib, stdenv, buildPackages
+, newScope, overrideCC, crossLibcStdenv, libcCross
+}:
+
+lib.makeScope newScope (self: with self; {
+
+  cygwinSetup = callPackage ./cygwin-setup { };
+
+  jom = callPackage ./jom { };
+
+  w32api = callPackage ./w32api { };
+
+  mingwrt = callPackage ./mingwrt { };
+  mingw_runtime = mingwrt;
+
+  mingw_w64 = callPackage ./mingw-w64 {
+    stdenv = crossLibcStdenv;
+  };
+
+  crossThreadsStdenv = overrideCC crossLibcStdenv
+    (if stdenv.hostPlatform.useLLVM or false
+     then buildPackages.llvmPackages_8.clangNoLibcxx
+     else buildPackages.gccCrossStageStatic.override (old: {
+       bintools = old.bintools.override {
+         libc = libcCross;
+       };
+       libc = libcCross;
+     }));
+
+  mingw_w64_headers = callPackage ./mingw-w64/headers.nix { };
+
+  mingw_w64_pthreads = callPackage ./mingw-w64/pthreads.nix {
+    stdenv = crossThreadsStdenv;
+  };
+
+  mcfgthreads = callPackage ./mcfgthreads {
+    stdenv = crossThreadsStdenv;
+  };
+
+  npiperelay = callPackage ./npiperelay { };
+
+  pthreads = callPackage ./pthread-w32 { };
+
+  wxMSW = callPackage ./wxMSW-2.8 { };
+
+  libgnurx = callPackage ./libgnurx { };
+})